﻿#region license

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
// Copyright (c) 2011, Dr. Masroor Ehsan
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of the <organization> nor the
//       names of its contributors may be used to endorse or promote products
//       derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

#endregion

using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace LWEditor
{
    public static class ControlHelper
    {
        private const int WM_SETREDRAW = 0xB;

        [DllImport("user32.dll", EntryPoint = "SendMessageA", ExactSpelling = true, CharSet = CharSet.Ansi,
            SetLastError = true)]
        private static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);

        public static void SuspendDrawing(this Control target)
        {
            SendMessage(target.Handle, WM_SETREDRAW, 0, 0);
        }

        public static void ResumeDrawing(this Control target)
        {
            ResumeDrawing(target, true);
        }

        public static void ResumeDrawing(this Control target, bool redraw)
        {
            SendMessage(target.Handle, WM_SETREDRAW, 1, 0);

            if (redraw)
            {
                target.Refresh();
            }
        }
    }
}